Oxidative coal desulfurization using lime to regenerate...

Details Oxidative coal desulfurization using lime to regenerate... Oxidative coal desulfurization using lime to regenerate...

C - Chemistry, Metallurgy

10

L

196/11

C10L 9/06 (2006.01) C10L 9/02 (2006.01)

Patent

CA 1137431

12079 OXIDATIVE COAL DESULFURIZATION USING LIME TO REGENERATE ALKALI METAL HYDROXIDE FROM REACTION PRODUCT ABSTRACT A process for the removal of pyrite from coal which comprises preparing an aqueous slurry containing finely-divided coal particles; adding to the slurry an alkali metal hydroxide selected from the group consisting of sodium hydroxide, potassium hydroxide and lithium hydroxide, as well as mixtures thereof, in amounts suf- ficient to continuously maintain the pH of the slurry at a value of below about 8; agitating the slurry while treat- ing the slurry with oxygen or an oxygen-containing gas to convert the pyrite in the coal to a soluble alkali metal sulfate; reacting lime with the so-formed alkali metal sulfate to regenerate the alkali metal hydroxide and then recycling the hydroxide for use in the process. S P E C I F I C A T I O N

342275

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